Measuring broadband magnetic fields on the nanoscale using a hybrid quantum register

Abstract

The generation and control of fast switchable magnetic fields with large gradients on the nanoscale is of fundamental interest in material science and for a wide range of applications. However, it has not yet been possible to characterize those fields at high bandwidth with arbitrary orientations. Here, we measure the magnetic field generated by a hard-disk-drive write head with high spatial resolution and large bandwidth by coherent control of single electron and nuclear spins. We are able to derive field profiles from coherent spin Rabi oscillations close to the gigahertz range, measure magnetic field gradients on the order of 1 mT nm and quantify axial and radial components of a static and dynamic magnetic field independent of its orientation. Our method paves the way for precision measurement of the magnetic fields of nanoscale write heads, which is important for future miniaturization of these devices.

Nitrogen-vacancy ensemble magnetometry based on pump absorption

“…The three-peak feature of the ADMR spectrum in Fig. 2(a) is a consequence of the hyperfine interaction between the NV electron spin and the intrinsic 14 Fig. 2(b).…”

“…Several novel applications using diamond sensors are currently being developed in the fields of neuroscience [7,8], cellular biology [9,10], nanoscale magnetic resonance microscopy [11], paleomagnetism [12], and microelectronics [13,14].…”

Vector Magnetometry Using Silicon Vacancies in4H-SiC Under Ambient Conditions

“…The NV high-spin system (S ¼ 1) and its C 3V symmetry allow determining not only the field strength but also the polar-angle orientation of the external magnetic field [7,8]. The long-lived spin states and optically detected magnetic resonance (ODMR) have led to high sensitivity [1] and when combined with optical or scanning probe microscopy, optical magnetic imaging with nanometer-scale spatial resolution has been demonstrated as well [4,7,[9][10][11][12][13].…”

Structural Analysis of Nuclear Spin Clusters via 2D Nanoscale Nuclear Magnetic Resonance Spectroscopy

“…Unlike in an ensemble NMR experiment, the strong gradient field (about 0.1 mT nm −1 ) from NV center splits the homonuclear spins spectrum of a single molecule. With an artificially fabricated antena, a much larger gradient up to 10 mT nm −1 is possible. Utilized by multinuclear species correlation sequence, the 2D heteronuclear spin resonance sequence is shown in Figure 4d, analogous to the homonuclear one (Figure 3a).…”